Edge control system and method for transformer area side distributed energy storage

Abstract

The invention discloses an edge control system and method for transformer area side distributed energy storage, and relates to the technical field of electric power Internet of Things. Comprising a control module, a real-time monitoring module, a data management module, a load management module and a communication and protocol conversion module, the control module comprises bus voltage control and power coordination control; the real-time monitoring module is used for collecting all monitored operation parameters and states to carry out real-time and timing data; the data management module is used for configuring and displaying various kinds of information; the load management module is used for carrying out classified management on loads according to the requirement of a user on power supply reliability and the loss or influence degree caused by power supply interruption; and the communication and protocol conversion module comprises four Ethernet ports, realizes protocol conversion and sends out according to a protocol specified by monitoring. The stability and reliability of the power system can be effectively improved, and reasonable utilization of renewable energy sources is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of power Internet of Things, and particularly to an edge control system and method for distributed energy storage on the substation side. Background Art

[0003] In existing technical solutions, the patent "Distributed Energy Storage Regulation Method and System Based on Cloud Platform and Edge Controller" is uniformly scheduled by the grid-side dispatching service center to realize the demand information interaction between the cloud platform and the edge controllers connected to each dispatching service center. The cloud platform determines the actual charge and discharge states and actual charge and discharge powers of each distributed energy storage system in the distributed resource aggregate corresponding to the edge controller, and controls each distributed energy storage system in the distributed resource aggregate corresponding to the edge controller according to the demand. The autonomous control terminal of the distributed energy storage device disclosed in the patent "Autonomous Control Terminal and Operation Method of a Distributed Energy Storage Device" includes a data acquisition module, an edge computing module, a decision-making control module, and a communication module. The data acquisition module is used to collect data of the distributed energy storage device and send the collected data to the edge computing module for analysis. The decision-making control module formulates corresponding decision instructions according to the analysis results in the edge computing module to control the operation state of the energy storage device.

[0004] Generally speaking, most of the functions and regulation performances of existing edge control systems still rely on the master station system or the cloud, while a separate autonomous system is prone to fall into the optimization of the local system, bringing potential risks to the overall system. Summary of the Invention

[0005] In view of the problems existing in the above background art, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to automatically coordinate the energy storage output according to the real-time operation state of the distribution substation, so that the distribution substation can achieve more optimized operation on the premise of meeting safe operation.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides an edge control system for distributed energy storage on the substation side, which includes a control module, a real-time monitoring module, a data management module, a load management module, and a communication and protocol conversion module; the control module includes bus voltage control and power coordination control; the real-time monitoring module is used to collect all monitored operating parameters and states for real-time and timed data; the data management module is used for the configuration and display functions of various information; the load management module is used to classify and manage the load according to the user's requirements for power supply reliability and the loss or impact degree caused by power supply interruption; the communication and protocol conversion module includes 4 Ethernet ports, realizes protocol conversion, and sends out according to the protocol specified by the monitoring.

[0009] As a preferred solution of the edge control system for distributed energy storage on the substation side according to the present invention, wherein: the bus voltage control includes obtaining the bus voltage of the distribution substation area and a preset allowable voltage range, and when the voltage exceeds this range, adjusting and dispatching the reactive power output of the energy storage to make the voltage return to the normal range.

[0010] As a preferred solution of the edge control method for distributed energy storage on the substation side according to the present invention, wherein: the power coordination control includes monitoring the active power output of the grid connection point and the energy storage, and adjusting and dispatching the active power output of the energy storage according to the current control strategy.

[0011] As a preferred solution of the edge control system for distributed energy storage on the substation side according to the present invention, wherein: the data management module further includes: displaying real-time alarm data and historical alarm data; classifying alarms and events according to types, and setting the priorities of alarms and events; judging whether an event needs to be alarmed; retrieving alarms and events according to various retrieval conditions.

[0012] As a preferred solution of the edge control system for distributed energy storage on the substation side according to the present invention, wherein: the 4 Ethernet ports support IEC 61850 / IEC 60870-5-101 / IEC 60870-5-103 / IEC 60870-5-104, 8 integrated serial ports (232 / 485), 2 CAN interfaces, 2 inputs, and 2 outputs.

[0013] In a second aspect, an embodiment of the present invention provides an edge control method for distributed energy storage on the substation side, which includes that the edge control for distributed energy storage on the substation side is divided into local control and remote control; when working in the local control state, execute the local charge and discharge curve according to the local setting value; when working in the remote control state, receive the power scheduling instruction from the cloud management system.

[0014] As a preferred embodiment of the edge control method for the distribution-side distributed energy storage facing the substation area of the present invention, when operating in the remote control state, the specific operations are as follows: Set the upper voltage limit value, the lower voltage limit value, the upper SOC limit value, the lower SOC limit value, and the active charging SOC fixed value; Monitor the substation area voltage in real time. If the substation area voltage and SOC do not meet the conditions, the current energy storage operates in the substation area voltage over-limit control working mode; Set the minimum power for grid connection, the maximum power for energy storage charging, the maximum power for energy storage discharging, and the active discharging SOC fixed value; Set the conditions for the energy storage to start charging and discharging; Define the fixed values for different time periods, which are respectively used for the charge and discharge settings of each time period; Turn on the remote control, and the distributed energy storage of the adjacent substation areas is controlled collaboratively.

[0015] As a preferred embodiment of the edge control method for the distribution-side distributed energy storage facing the substation area of the present invention, when performing charge and discharge operations, the energy storage of the current substation area operates in the demand control working mode.

[0016] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, where the memory stores a computer program, and: When the computer program instructions are executed by the processor, the steps of the edge control method for the distribution-side distributed energy storage facing the substation area as described in the second aspect of the present invention are implemented.

[0017] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and: When the computer program instructions are executed by the processor, the steps of the edge control method for the distribution-side distributed energy storage facing the substation area as described in the second aspect of the present invention are implemented.

[0018] The beneficial effects of the present invention are as follows: The edge control system for the distribution-side distributed energy storage facing the substation area of the present invention can effectively improve the stability and reliability of the power system, promote the rational utilization of renewable energy, and achieve a double improvement in economic and social benefits through flexible load management strategies. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a front view of the edge controller for the distribution-side distributed energy storage facing the substation area.

[0021] Figure 2 It is a rear view of the edge controller for the distribution-side distributed energy storage facing the substation area.

[0022] Figure 3 It is a control flow chart for voltage over-limit governance in the substation area.

[0023] Figure 4 It is a control flow chart for preventing reverse power flow of photovoltaic.

[0024] Figure 5 It is a control flow chart for peak shaving and valley filling.

[0025] Figure 6 It is a control flow chart for demand management.

[0026] Figure 7 It is a control flow chart for adjacent substation areas to cooperate in governing the substation area voltage. Specific implementation manners

[0027] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings of the specification.

[0028] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from this description. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0029] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0030] Embodiment 1

[0031] Referring to Figures 1 to 7 , this is the first embodiment of the present invention. This embodiment provides an edge control system for distributed energy storage on the substation area side, including

[0032] a control module, a real-time monitoring module, a data management module, a load management module, and a communication and protocol conversion module;

[0033] The control module includes bus voltage control and power coordination control. It acquires the bus voltage of the distribution substation area and a preset allowable voltage range. When the voltage exceeds this range, it adjusts and dispenses the reactive power output of the energy storage to restore the voltage to the normal range; it monitors the active power output of the grid connection point and the energy storage, and adjusts and dispenses the active power output of the energy storage according to the current control strategy.

[0034] The real-time monitoring module can collect all monitored operating parameters and states for real-time and timed data, and process and store important historical data in the database.

[0035] Further, the collected data includes common information such as the total voltage, current, average temperature, SOC, SOH, charge and discharge current limits, single-cell maximum and minimum battery voltages, single-cell maximum and minimum battery temperatures, fault and alarm information, historical charge and discharge power, and historical charge and discharge energy of each group of batteries in the BMS system. The relevant parameters of the PCS include the voltage / current / power of each branch on the DC side, the active power, reactive power, voltage, current, power factor, frequency and temperature of each phase on the AC side, cabinet temperature, operating status, alarm and fault information, etc., as well as the daily charge, daily discharge, cumulative charge, and cumulative discharge.

[0036] The data management module is used to support the configuration and display functions of various information such as SOE information, change information, overlimit information, abnormal information, alarm events, protection events, and maintenance information.

[0037] Further, real-time alarm data and historical alarm data can be displayed. Alarms and events can be classified according to types, and the priorities of alarms and events can be set, as well as determining whether an event requires an alarm. Alarms and events can be retrieved according to various retrieval conditions such as device, time, event level, and event type.

[0038] The load management module is used to classify and manage the load according to factors such as the user's requirements for power supply reliability and the losses or impacts caused by power interruption to personal safety, the operation safety of the distribution substation area, and the economy.

[0039] Further, according to the load classification, load switching strategies and plans for different operating conditions of the distribution substation area are formulated in advance; in the off-grid state, power-limiting strategies can be implemented for each load terminal respectively, including control rounds, control time periods, power setting values, and power quantity setting values.

[0040] The communication and protocol conversion module includes 4 Ethernet ports supporting IEC 61850 / IEC

[0041] 60870-5-101 / IEC 60870-5-103 / IEC 60870-5-104, 8 integrated serial ports (232 / 485), 2 CAN interfaces, 2 input channels, and 2 output channels.

[0042] Further, protocol conversion is realized and sent according to the protocols specified by the monitoring (CDT, 101, 104, DNP).

[0043] Furthermore, this embodiment also provides an edge control method for distributed energy storage on the substation area side. Among them, the edge control for distributed energy storage on the substation area side is divided into local control and remote control:

[0044] When operating in the "local control" state, the local charge and discharge curve is executed according to the local set values. When operating in the "remote control" state, power scheduling instructions from the cloud management system are received. The specific steps are as follows:

[0045] a) Voltage over-limit governance in the substation area. Set the upper voltage limit value Uhigh, the lower voltage limit value Ulow, the upper SOC limit value SOCMax, the lower SOC limit value SOCMin, and the active charging SOC set value SOCcharge.

[0046] Furthermore, the substation area voltage U0 is monitored in real time. If U0 and SOC do not meet the conditions, the current energy storage operates in the substation area voltage over-limit governance working mode.

[0047] Specific settings: When U0 > Uhigh & SOC < SOCMax, the energy storage starts charging; when U0 < Ulow & SOC > SOCMin, the energy storage starts discharging; when U0 < Uhigh & U0 > Ulow, the real-time charging power of the energy storage is obtained according to the battery allowable charging power and the maximum energy storage charging power.

[0048] b) Prevent reverse power flow of photovoltaic power. Set the minimum power for grid connection Pmin, the maximum charging power of the energy storage PcMax, the maximum discharging power of the energy storage PdMax, and the active discharging SOC set value SOCdisC.

[0049] Furthermore, the power P0 at the grid connection point of the substation area is monitored in real time. When P0 < Pmin & SOC < SOCMax, the energy storage starts charging; when P0 > Pmin & SOC > SOCdisC and within the set fixed time period (the purpose is to allow the energy storage to discharge during a suitable time period such as the evening peak), the energy storage starts discharging.

[0050] c) Peak shaving and valley filling. Define the following time period set values: start time period, end time period, time period charge and discharge selection, time period charge and discharge power. There are a total of 6 time periods, which can be used for charge and discharge settings for each time period respectively.

[0051] d) Demand management. When charge and discharge operations are performed, the current energy storage in the substation area operates in the demand control working mode.

[0052] e) Instructions issued by the cloud. Turn on "remote control", and the distributed energy storage in adjacent substations is coordinated and controlled to achieve functions such as improving the power supply quality of the substation area, preventing reverse power flow of distributed photovoltaic power generation in the substation area, and smoothing the load curve through peak shaving and valley filling on the user side.

[0053] This embodiment also provides a computer device, which is applicable to the scenario of the edge control method for distributed energy storage on the substation side, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the edge control method for distributed energy storage on the substation side as proposed in the above embodiment.

[0054] The computer device can be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a carrier network, NFC (Near Field Communication), or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad set on the shell of the computer device, or an external keyboard, a touchpad, or a mouse, etc.

[0055] This embodiment also provides a storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the edge control method for distributed energy storage on the substation side as proposed in the above embodiment.

[0056] In summary, the edge control system for distributed energy storage on the substation side of the present invention can effectively improve the stability and reliability of the power system, promote the rational utilization of renewable energy, and achieve a double improvement in economic and social benefits through a flexible load management strategy.

[0057] Embodiment 2

[0058] Refer to Figures 1 to 2 , which is the second embodiment of the present invention. This embodiment provides an edge control system and method for distributed energy storage on the substation side. In order to verify the beneficial effects of the present invention, scientific demonstrations are carried out through relevant data.

[0059] Such as Figure 1 and Figure 2, the present invention adopts advanced industrial-grade chips. The electrical isolation and electromagnetic shielding designs comply with international standards. All communication ports are designed against lightning strikes and provide 2500VDC surge protection. The hardware system of the device has extremely high anti-interference ability and working reliability; diverse and flexible communication interfaces: provide 4 Ethernet ports; 2 CAN ports; 8 integrated serial ports (232 / 485); 1 debugging port; 2 input ports, 2 output ports, and a standard 1U chassis, which is convenient for assembling into a screen.

[0060] Furthermore, the distributed energy storage edge controller provided by the present invention can automatically regulate the output of distributed energy storage according to the real-time operation status of the substation area, so that the distribution substation area can achieve optimized operation under the condition of meeting safe operation. The control method sets four control strategies for single substation area autonomous control and the cloud regulation strategy for adjacent substation areas specifically. The parameter settings are shown in the following table:

[0061]

[0062]

[0063]

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An edge control system for distributed energy storage at the station side, characterized by: include, Control module, real-time monitoring module, data management module, load management module and communication and protocol conversion module; The control module includes bus voltage control and power coordination control; The real-time monitoring module is used to collect all monitored operating parameters and states for real-time and scheduled data; The data management module is used for configuration and display functions of various information; The load management module is used to classify and manage loads according to the user's requirements for power supply reliability and the degree of loss or impact caused by power outage; The communication and protocol conversion module includes 4 Ethernet ports to realize protocol conversion and send out according to the protocol specified by the monitoring.

2. The edge control system for distributed energy storage at the station side according to claim 1, characterized in that: The bus voltage control includes obtaining the bus voltage of the distribution station area and pre-setting the allowable voltage range. When the voltage exceeds the range, the energy storage reactive output is adjusted to restore the voltage to the normal range.

3. The edge control system for distributed energy storage at the station side as claimed in claim 2, characterized in that: The power coordination control includes monitoring the active output of the grid connection point and the energy storage, and adjusting and dispatching the active output of the energy storage according to the current control strategy.

4. The edge control system for distributed energy storage at the station side as claimed in claim 3, characterized in that: The data management module also includes: Display real-time alarm data and historical alarm data; Classify alarms and events by type and set their priorities; Determine whether to issue an alarm for the event; Search for alarms and events according to various search criteria.

5. The edge control system for distributed energy storage at the station side as claimed in claim 4, characterized in that: The 4 Ethernet ports support IEC 61850 / IEC 60870-5-101 / IEC 60870-5-103 / IEC 60870-5-104, 8 integrated serial ports (232 / 485), 2 CAN interfaces, 2 inputs and 2 outputs.

6. An edge control method for distributed energy storage at the substation side, based on the edge control system for distributed energy storage at the substation side according to any one of claims 1 to 4, characterized in that: Also includes, Edge control for distributed energy storage at the substation side is divided into local control and remote control; When working in the local control state, the local charge and discharge curve is executed according to the local set value; When working in remote control state, it receives power scheduling instructions from the cloud management system.

7. The edge control method for distributed energy storage at the station side as claimed in claim 5, characterized in that: When working in remote control state, the specific operations are as follows: Set the voltage upper limit, voltage lower limit, SOC upper limit, SOC lower limit, and active charging SOC constant; Monitor the substation voltage in real time. If the substation voltage and SOC do not meet the conditions, the current energy storage will operate in the substation voltage over-limit management working mode; Set the minimum off-grid power, maximum energy storage charging power, maximum energy storage discharging power, and active discharging SOC constant; Set the conditions for starting to charge and discharge the energy storage; Define fixed values ​​for different time periods, which are used for charging and discharging settings in each time period; Turn on remote control and coordinate control by distributed energy storage in adjacent substations.

8. The edge control method for distributed energy storage at the station side according to claim 6, characterized in that: When charging and discharging operations are performed, the current area energy storage operates in the demand control working mode.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the edge control system for distributed energy storage at the substation side as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the edge control system for distributed energy storage at the substation side as described in any one of claims 1 to 7 are implemented.

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